MCP server

Stackin Official

io.github.stackin-io/stackin

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Issue and manage Brazilian fiscal documents: NF-e for goods, NFS-e for services.

Website Source

At a glance

Type

MCP server

Publisher

stackin.io (verified by the MCP Registry)

Status

Working at last check

Tools

16

Token cost

About 15,742 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http stackin https://mcp.stackin.io/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.stackin]
url = "https://mcp.stackin.io/mcp"

Gemini CLI

{"mcpServers":{"stackin":{"httpUrl":"https://mcp.stackin.io/mcp"}}}

Cursor

{"mcpServers":{"stackin":{"url":"https://mcp.stackin.io/mcp"}}}

VS Code

{"servers":{"stackin":{"type":"http","url":"https://mcp.stackin.io/mcp"}}}

Antigravity

agy mcp add stackin https://mcp.stackin.io/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"stackin","server_url":"https://mcp.stackin.io/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"stackin","server_url":"https://mcp.stackin.io/mcp"}

Tools

• cancel_invoice ~330 tokens
  Cancel an authorized invoice. Legal cancellation, with fiscal and accounting effect, inside a window the NFS-e authorizer enforces for the municipality. Ask the human to confirm before calling; never call it speculatively. The reason reaches the tax authority verbatim and must be at least 15 charac
• consult_invoice ~115 tokens
  Look up an invoice's current status by its access key. Read-only: it never changes the document.
• correct_invoice ~250 tokens
  File an electronic correction letter (CC-e) against an NF-e. NF-e only: there is no correction letter for an NFS-e, where a wrong document is cancelled and issued again. It corrects wording and non-fiscal fields only. It cannot change values, taxes, the recipient or the products — those still requ
• get_invoice_pdf ~174 tokens
  Return the printable rendering of a document, as a PDF. Works for both types — a DANFE for nfe, a DANFSe for nfse. The PDF comes back base64-encoded in content_base64; the XML, not this, is the legally valid document. A 502 from here means the authorizer is unavailable, not that the invoice is wron
• get_invoice_submissions ~255 tokens
  Show every attempt made for one invoice and what came back. This is the tool that answers "why was it rejected". consult_invoice gives the status; this gives the tax authority's own code, its message, and the request and response exactly as they went over the wire. Read-only. It takes the invoice_
• invalidate_numbering ~306 tokens
  Declare an NF-e numbering range reserved but never used. NF-e numbering has to be continuous, so a gap left by a failed issuance is explained to the SEFAZ with this — not with a new document. Irreversible: a number declared unused can never be used. Only for numbers that were never authorized. An
• issue_invoice ~11732 tokens
  Issue a Brazilian fiscal document: NFS-e or NF-e. This produces a legal fiscal document. Confirm the data with the user before calling when you inferred any field. Every item needs a price: unit_price is what one unit costs and amount is the line's gross total. Send unit_price with quantity when t
• list_fiscal_kinds ~162 tokens
  Which classifications this country has data for, right now. Ask this before assuming a classification exists. The answer grows as the source data does, so a name absent here is absent today rather than absent forever.
• list_invoices ~358 tokens
  List the invoices this company issued, newest first. One document type at a time: pass nfse for services or nfe for goods. A company that issues both has to be asked twice. Use it for "my last invoices", "what was rejected today", and to find a document whose access key the user does not have at h
• list_received_invoices ~222 tokens
  List NF-e documents other companies issued against this one. The mirror of list_invoices: that one shows what this company issued, this one what it received. Read-only. It reads what the API already collected and never calls the tax authority, which caps how often a company may ask per day. Each r
• lookup_fiscal_code ~319 tokens
  Resolve one code of one classification, when you know both. Use this to confirm a code before putting it on a document — an NCM that does not exist is rejected by the tax authority after issuing, which costs a cancellation. A code that is not there answers 404. That means the code is wrong, not th
• lookup_taxpayer ~300 tokens
  Look up one taxpayer by exact tax id, to confirm who it is. Use it to check a recipient's name before issuing against them. It takes the id exactly — punctuation is fine, but there is no search by name, by prefix or by state, and there will not be: the registry holds the names and addresses of real
• manifest_received_invoice ~324 tokens
  Declare this company's position on a document issued against it. Legally binding and irreversible once the tax authority accepts it — ask the human to confirm before calling, and read back which document and which of the four positions is being filed. Denying a document (210220) or declaring the o
• reissue_invoice ~187 tokens
  Retry a rejected invoice after the data that caused the rejection was fixed. Takes the local invoice_id, not the access key: a rejected document never got one. Consumes a credit like a new issuance, so it takes an idempotency_key for the same reason issue_invoice does. An authorized invoice is corr
• search_fiscal_codes ~420 tokens
  Find a code from a description, or page through a table. This is the tool for "what NCM is a keyboard" — the one the user actually asks. Prefer it over guessing a code from memory: the tables change, and a plausible wrong code is worse than a lookup. Leaving `kind` unset searches every classificat
• validate_invoice_payload ~288 tokens
  Check invoice data against the field rules without issuing anything. Nothing is sent to the tax authority and no document is created. The SDK models check field formats, and for nfe the rules the SEFAZ refuses a document over: ncm and cfop on every item, and a complete recipient address. Worth call

Browse

• GitHub tools
• PDF tools
• Invoicing and accounting
• Web analytics
• Legal research

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